It's more of a side-step than a step backwards or forwards. Just different materials, but not objectively "better" or "worse". Most of the reviewers have stated it looks and feels "better", but the same thing happened when they went to metal. As pointed out, the main advantage of going with glass is that wireless charging will work. Possibly, the phone may get better reception as well, but that's just speculation. I think it'll be a bit grippier to hold onto for the most part, but that my dependent more on the person's hands than anything else. I don't think having a glass back is going to make that much difference if you drop the phone... dropping it onto a hard surface is going to have major ramifications either way (front or back). Apple claims it is the toughest glass yet on a Smartphone, but that'll have to be tested (scratches will probably be about the same, but it's more shatterproof, that'll be an improvement).